import java.io.*;
import java.util.*;

public class PrintStreamTest {
    static public Scanner sc = new Scanner(System.in);
    static public void main(String [] args) throws Exception {
        // PrintStream out = new PrintStream("./file.test");
        // PrintStream out = new PrintStream(new FileOutputStream(FileDescriptor.err), false);
        // 默认缓冲区大小: 8192字节
        PrintWriter out = new PrintWriter(System.out);
        out.write("hello world");
        out.flush();

        // out.close();
    }
}
